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Assert: When an assembly asserts a permission, it is claiming that it is safe for any callers to perform an action, regardless of whether or not they have permission to perform it. If you have a DLL that stores information in a specific key in the registry, accessing only a hard-coded key, you know it s safe for any callers to execute this method, even those that don t have the right to access the registry. By asserting the Registry permission, you declare that all callers may perform this operation. The stack walk will be stopped at this point, and the permissions of callers further up the call stack won t be checked. In order to assert a permission, your assembly must have that permission itself, and also the assertion security permission. SQL Server assemblies can never assert permissions. Deny: If you want to prevent methods that you re calling into further down the call stack from performing specific operations, you can deny a permission. In this case, if any method further down the call stack requests that permission, it will be refused. However, note that, because an assertion stops the stack walk, denying a permission won t prevent a method further down the call stack from performing an action if an assertion is made anywhere between the two methods. PermitOnly: This action prevents a permission being granted further down the call stack for any resource except the one(s) named. For example, you can use PermitOnly to ensure that a method can be used only to access a particular file or group of files. As with Deny, a PermitOnly will be ignored if an Assert occurs further down the call stack.

a copy-on-write happens, all the pages are zeroed out except for the changed data page, if a new 64KB block is allocated. When other pages change, individual pages are copied over to the 64KB block. Let s look at typical operations and how they affect snapshots. When an application updates a value in the database, before the new value is written, the database makes a copy of that page to the snapshot in its sparse file. SQL Server maintains a bitmap for the related sparse file so that SQL can quickly decide where the I/O should go on a read operation, since the snapshot or the original database may contain the correct information. When a read operation comes in, if the snapshot already contains the correct data, SQL will go to the snapshot for the information. If the data has not changed in the original database and therefore hasn t been copied to the snapshot, SQL will go to the original database to retrieve the information. No locks are taken on the original database when a read happens for a snapshot. Figure 15-15 shows this process for database snapshots.

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Anything that runs against SQL Server has the potential to affect performance. Obvious impediments include replication or using the SQL Server to run Sharepoint or Biztalk. The less-obvious ones include implementing a heavy recovery model or more-intensive logging options. Also ensure that memory options are sufficient so that SQL Server has enough to operate but also that SSIS gets a good share. Remember that the SQL Server engine and SSIS are entirely separate entities. Reviewing your SQL Server settings is certainly well worth considering. Generally speaking, however, these settings will get reviewed when it comes to promoting packages to the production environment anyway, so I m probably preaching to the converted.

Figure 15-15. Database snapshots You may be wondering how database snapshots can work with database mirroring since the database on the mirror is restoring. Through the magic of code, database snapshots get an exclusive latch on the mirror database, so that snapshots can read the data in a mirrored database. Finally, you can speed up the population of a snapshot with some routine maintenance on your source database. For example, if you rebuild an index, you may find that your snapshot will start growing very fast as the index is rebuilt. You may not have intended for this to happen, so be aware that if anything changes the source database, the snapshot will grow.

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